A functional disorder is a medical condition that impairs the normal function of a bodily process, but where every part of the body looks completely normal under examination, dissection or even under a microscope. ... Definitions vary somewhat between fields of medicine.
Functional neurological disorder (FND) is a condition in which patients experience neurological symptoms such as weakness, movement disorders, sensory symptoms and blackouts. The brain of a patient with functional neurological symptom disorder is structurally normal, but functions incorrectly.
Physical symptoms of neurological problems may include the following:
The term functional (psychogenic) movement disorders (FMD) has historically been applied to disorders that manifest with physical symptoms—specifically (gait disorders, tremor, dystonia, etc.)—but which cannot be attributed to any of known underlying organic disorder and which instead is presumed